When we check the air conditioning, we mainly check the condenser of the air conditioning, and clean the surface of the condenser. If there is too much dust, we must clean it in time and clean it with compressed air. In doing so, we must check the performance of the switches and control elements to check the reliability of their performance and whether there is a lack of fluorine in the air conditioning. If the refrigerant of the vehicle is insufficient, this will cause the air conditioning to lose its cooling effect. Attention must also be paid to the possibility of leakage of refrigerants. It is also possible to effectively treat the parts of the compressor surface by observation, mainly the surface of the compressor, the hose and the oil trace at the joint site.